Title:
Method of protecting documents
United States Patent 1374208

Inventors:
William, Jones John
Publication Date:
04/12/1921
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Assignee:
William, Jones John
Primary Class:
427/1
Other Classes:
118/31.500, 283/69, 430/10, 283/78, 264/30
International Classes:
B42D15/00; G03C5/04; G03C7/00